Modeling ion effects for the Argonne Advanced Photon Source upgrade
Abstract
Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beams potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. This paper will discuss the possibility of ion trapping and instability in the APS-Upgrade storage ring. The question of where ions will be trapped is addressed using simple analytical calculations, while the instability is modeled with computer simulations. A scheme is proposed for mitigating the ion instability, by using train gaps with a high charge bunch before and after the gap to minimize rf transients. The reduction in ion density due to nonevaporable getter coating is also discussed.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1607560
- Alternate Identifier(s):
- OSTI ID: 1798841
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 11; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; beam code development & simulation techniques; beam instabilities; high intensity beam dynamics; relativistic multiple-particle dynamics
Citation Formats
Calvey, J., and Borland, M.. Modeling ion effects for the Argonne Advanced Photon Source upgrade. United States: N. p., 2019.
Web. doi:10.1103/PhysRevAccelBeams.22.114403.
Calvey, J., & Borland, M.. Modeling ion effects for the Argonne Advanced Photon Source upgrade. United States. https://doi.org/10.1103/PhysRevAccelBeams.22.114403
Calvey, J., and Borland, M.. Fri .
"Modeling ion effects for the Argonne Advanced Photon Source upgrade". United States. https://doi.org/10.1103/PhysRevAccelBeams.22.114403.
@article{osti_1607560,
title = {Modeling ion effects for the Argonne Advanced Photon Source upgrade},
author = {Calvey, J. and Borland, M.},
abstractNote = {Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beams potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. This paper will discuss the possibility of ion trapping and instability in the APS-Upgrade storage ring. The question of where ions will be trapped is addressed using simple analytical calculations, while the instability is modeled with computer simulations. A scheme is proposed for mitigating the ion instability, by using train gaps with a high charge bunch before and after the gap to minimize rf transients. The reduction in ion density due to nonevaporable getter coating is also discussed.},
doi = {10.1103/PhysRevAccelBeams.22.114403},
journal = {Physical Review Accelerators and Beams},
number = 11,
volume = 22,
place = {United States},
year = {2019},
month = {11}
}
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https://doi.org/10.1103/PhysRevAccelBeams.22.114403
https://doi.org/10.1103/PhysRevAccelBeams.22.114403
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